Poonam, 12, (right) is celebrating Diwali, the Hindu festival of lights, next to her oldest sister Arti, 18, in the front yard of their family's newly built home in Oriya Basti, one of the water-contaminated colonies in Bhopal, central India, near the abandoned Union Carbide (now DOW Chemical) industrial complex, site of the infamous '1984 Gas Disaster'.